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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Paper

Written Paper

Interrelationship of zinc and vitamin A metabolism in animal and human nutrition: A review  [1982]

Smith, J.C. Jr.;

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Recent human and animal nutrition research studies concerning possible associations between zinc (Zn) and vitamin A are reviewed and critiqued. A consistent finding was the depression of blood vitamin A levels in Zn-deficient animals having adequate vitamin A in their diets. This depression appears to be due to a nonspecific response to food intake and growth restrictions associated with Zn deficiency, rather than to Zn deficiency per se. Liver vitamin A levels are usually unaltered in Zn deficiency, suggesting that vitamin A absorption and transport to the liver are unimpaired. Zn deficiency, however, affects both the plasma and liver retinol-binding protein (RBP) levels; hence, Zn deficiency may impair RBP synthesis. Limited human studies suggest that Zn supplementation may benefit vitamin A metabolism only in the case of Zn deficiency. (wz)

Bibliographic information

Language:
English
In AGRIS since:
1986
Publisher:
A.R. Liss
All titles:
"Interrelationship of zinc and vitamin A metabolism in animal and human nutrition: A review"@eng
Other:
"charts. 61 ref. Literature review"
"Clinical, biochemical, and nutritional aspects of trace elements. Current topics in nutrition and disease, Prasad, A.S. (ed.).- New York (USA): A.R. Liss, 1982.- ISBN 08-451-16053. p. 239-258"
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Bibliographic information

Language:
English
In AGRIS since:
1986
Publisher:
A.R. Liss
All titles:
"Interrelationship of zinc and vitamin A metabolism in animal and human nutrition: A review"@eng
Other:
"charts. 61 ref. Literature review"
"Clinical, biochemical, and nutritional aspects of trace elements. Current topics in nutrition and disease, Prasad, A.S. (ed.).- New York (USA): A.R. Liss, 1982.- ISBN 08-451-16053. p. 239-258"